I am facing a trouble in executing a command in c# process with arguments. The command runs well in CMD but it returns no result with System.NotSupported Exception.

        string pdfkPath = @"C:Dummy ProjectsTestBCLConsoleApp1ConsoleApp1binDebugpdftk.exe";
        var cmd = @"D:TestBCLSample.pdf dump_data | findstr NumberOfPages";

        var proc = new Process
        {
            StartInfo = new ProcessStartInfo
            {
                FileName = pdfkPath,
                Arguments = cmd,
                UseShellExecute = false,
                RedirectStandardOutput = true,
                CreateNoWindow = true
            }
        };

        proc.Start();

        var output = proc.StandardOutput.ReadToEnd();

The below command gives proper result in CMD, but no luck in C# code.

pdftk.exe D:TestBCLSample.pdf dump_data | findstr NumberOfPages

I tried to use various solution including using /C /K. Or try to escape the Pipe | Operator but not getting any help with them.